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Message: <blockquote data-quote="brian84corvette" data-source="post: 8305182" data-attributes="member: 586635">just some quickie info on batterys -normal wet cell car batterys and agm batterys should not mix because = normal car batterys will want to sit near 12.7 volts - and agm batterys will want to sit at 13.0 volts.   the agm will always be trying to feed its charge to the wet cell battery - and this process wears out both of the batterys.i had a wet cell normal car battery under the hood for a while - and 3 100 amp hour agm batterys in the rear  all hooked together.the agm batterys killed the wet cell up front and i was having issues i could not figure out.    my dmm was reading 13.0 volts at the battery ( they were all hooked together still )   but i had weird drops when playing.when i un hooked every battery from eachother  - and let them sit for 3 hours...    my dmm read 13.0 volts on all 3 rear agm batterys - but the front wet cell was reading 12.3 volts...   and the next day it was reading 12.6 volts with out charging it back up.    = that battery went bad by being constantly fed more than it wanted from the agms...  but its low 12.3 resting voltage was pulling down the system voltage when trying to play "big"since then ive added another agm up front - same size and kind as my 3 in the rear - and now they all rest at 13.0 hapily for days with out re charge.good batterys have a low internal ohm resistance that allows them to give off a ton of power in a short amount of time.this is strictly for explination purpose and not real numbers but....if you were to touch the positive of a battery to the negative of the same battery and cause a dead short - this would allow the battery to give off its maximum avalable current and amps its capable of.a wet cell can only give off power so fast - as its internal resistance is general higher than a good car audio agm battery.so letts say you did that on your normal car starting battery and measured ...   250amps in exactly 1.0 second timed - a good agm battery might give off 400 amps in that same 1.0 seconds time because it allows power to leave the battery faster than normal batterys do.this is great for car audio because the way car stereo amps ask for power is instantanious and sometimes for only split seconds.during a big bass note - a car stereo amp may say to the elecrical system - hey give me 350 amps for .5 seconds duration so i can send that to the subs...but if you only have one normal wet cell car battery feeding the system - the battery may say to the amp - thanks for your request but my maximum capacity is to give you 175amps in that .5 seconds time your asking for that power....     so you can see how the amp will need power but not recieve it due to the capability of the electrical system to feed what its only capable of doing....i hope that makes sence</blockquote>

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